\newproblem{lay:3_2_18}{
  % Problem identification
	\begin{large}
	  \hspace{\fill}\newline
    \textbf{Lay, 3.2.18}
	\end{large}
	\\
  \ifthenelse{\boolean{identifyAuthor}}{\textit{Carlos Oscar Sorzano, Aug. 31st, 2013} \\}{}

  % Problem statement
  Assume
	$\left|\begin{array}{rrr}a & b & c \\ d & e & f \\ g & h & i\end{array}\right|=7$. Calculate
	$\left|\begin{array}{rrr}g & h & i \\ a & b & c \\ d & e & f \end{array}\right|$.
}{
   % Solution
	\begin{center}
		$\begin{array}{rcl}
		   \left|\begin{array}{rrr}g & h & i \\ a & b & c \\ d & e & f \end{array}\right|&=&-\left|\begin{array}{rrr}a & b & c \\ g & h & i \\ d & e & f \end{array}\right|=
			   \left|\begin{array}{rrr}a & b & c \\ d & e & f \\ g & h & i\end{array}\right|=7
		\end{array}$
	\end{center}
}
\useproblem{lay:3_2_18}
\ifthenelse{\boolean{eachProblemInOnePage}}{\newpage}{}
